The Gem of Mastery is an essence gem which grants a moderate bonus to all three ability scores (Body, Mind, and Spirit). It is exclusive to followers of the Way of the Closed Fist, but the Gem of Unity provides followers of the Way of the Open Palm with the same bonuses. It is part of a series of gems with similar effects, being slightly stronger than the Gem of Struggle but slightly weaker than the Brilliant Gem of Balance.
It can be obtained in two different ways:
- In the Imperial City, it will be given to players as a reward by Captain Sen if they kill Aishi the Mournful Blade.
- In the Lotus Assassin Fortress, it can be purchased from Acolyte Trainer Guang.
In-game description: "The goal of every struggle, no matter what its initial justification, is dominance. Power over others and over fate will determine the true outcome of everything. This gem helps focus that mastery of destiny into pure strength for the wielder's body, mind and spirit."